I had the exact same bike until it was sadly stolen last year, the red white and black beast, great bike. I had a very similar problem with no spark and asked at a Yamaha garage, spoke to one of the mechanics thinking it was the cdi as well. He said I had gotten something in the fuel and fouled the plug, I realized it might have been from a jerry can on a camping trip...

Drain the carb, fit new plug and boom, started first kick and really surprised me. I ran a few tanks of carby / engine cleaner and then fitted a fuel filter, I highly recommend one. Any trouble starting then adjust the auto decomp, hold the lever just off max and adjust the cable, it slowly stretches and gets harder to start.

Another great tip I learned from at a guy at a garage when I flooded the engine which I sometimes did was- fuel tap off, lower the bike on it's side to drain the carb, with the ignition OFF and the throttle wide open give the bike one light kick over to clear the cylinder then start as normal. Always remember to NEVER EVER touch the throttle when starting or it could kick back and hurt you allot. And never start with the fuel tap on, turn it on when it starts, I used to regularly adjust the idle for cold mornings.

Hope this helps, good luck!

That's why mine used to kick back on me. The reason I got rid of that beast. At 145lbs didn't have enough arse to kick it after it broke in after a rebuild.

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Live free and ride hard

Very nice. I just started striping down my 85 TT600. How hard was it to add the lights or make it an Xt? Any threads on that? Thanks

You can get a electic parts from a XT 600. It will most be "bolt-on" deal. You need to mount a battery box.
i have seen them mounted right by the oil tank. Or right above the air box. You have to mount a key switch too! Hope this is a help!
BIG ED XT&TT& SRX 600 FAN!!!!

You could put an xt oil tank on it on the back and mount and xt battery box. You will have to make mounting tabs either way. However I would just put a battery eliminator under the seat after you put the electric parts to run your light and save the weight of a battery. Some question the ability to run blinkers , but if you use led turn signals and adjust the idle up a little it should be fine. I do not run blinkers and have no problem. The eliminator is about the size of a d battery. Accell makes them. Its just a capacitor. Let there be light. thumpthump.